CN109187322A - A kind of Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel - Google Patents
A kind of Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel Download PDFInfo
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- CN109187322A CN109187322A CN201811013265.XA CN201811013265A CN109187322A CN 109187322 A CN109187322 A CN 109187322A CN 201811013265 A CN201811013265 A CN 201811013265A CN 109187322 A CN109187322 A CN 109187322A
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Abstract
The invention discloses a kind of Evaluation of Corrosion Resistance methods of polar ocean environment low-alloy steel, it include: that low-alloy steel sample is placed in corrosive liquid to handle, processing terminate, the quantity in the field trash spot corrosion source of sample is observed, in microscope with the power of the corrosion resisting property of how much judgement polar ocean environment low-alloy steel of field trash spot corrosion source quantity；Wherein, corrosive liquid contains CuCl, SnCl2And FeCl3.The invention discloses a kind of Evaluation of Corrosion Resistance methods of polar ocean environment steel, and step is simple, and easy to operate, experimental period is short, convenient for formulating metal material selection scheme for the industries such as transportation equipment manufacture and the manufacture of steel construction structures in polar ocean environment.
Description
Technical field
The present invention relates to a kind of Evaluation of Corrosion Resistance methods of polar ocean environment low-alloy steel, are related to the survey of metal material
The pitting resistance for trying evaluation field, especially metal material evaluates field.
Background technique
Attention with people to marine resources development, more and more ocean platforms and novel sea transport equipment are answered
It transports and gives birth to, but many steel construction facilities and equipment fail to scrap due to reaching design life because of etching problem, so economical
The practical material of resistance to marine environment attracts attention.The corrosion-resistant metallic materials such as stainless steel material, nickel alloy, titanium alloy are because of price
It is prohibitively expensive to be used widely in marine environment, so the corrosion resistance for how improving low-alloy steel becomes problem hardly possible
Point, research are found: type, form, size of field trash etc. are affected to the pitting resistance of low-alloy steel.And marine environment
In, it is mostly scientific investigation activity that polar region cold zone, because of climate reasons, mankind's activity is less, the transport conveyed for scientific investigation and goods and materials
Requirement of the ship to making material is more harsh, needs preferable corrosion resistance.
The method for evaluating metal material pitting resistance is reported in document at present, as solution impregnates hanging slice method, electricity
Chemical potentiodynamic method etc., salt spray test method, alternate-immersion test method, corrosive liquid corrode metallographic microanalysis method etc.,
Its corrosive liquid corrodes metallographic microanalysis method and is able to detect influence of the field trash to metal material pitting resistance, such as " typical resistance to
(author is Cao Guoliang, Li Guoming, Chen Shan, Chang Wanshun, Chen Xuequn, out for the comparison of Ni and Cr resistance to spot corrosion effect in seawater corrosion steel
Place is Acta Metallurgica Sinica " in a text, use 3%NaCl solution as etchant solution, the pitting resistance of research material.Similar this
A little methods can be used for studying field trash to resistance to spot corrosion influence degree, but be that experimental period is relatively long the shortcomings that such methods,
And a kind of pitting resistance of material relative to another material can only be evaluated, it is not easy to quickly screen qualified corrosion resisting steel
Material.
Summary of the invention
Goal of the invention: aiming at the problems existing in the prior art, the present invention provides a kind of low conjunctions of polar ocean environment
The Evaluation of Corrosion Resistance method of Jin Gang, step is simple, and easy to operate, experimental period is short, convenient for transport in polar ocean environment
The industries such as equipment manufacturing and the manufacture of steel construction structures formulate metal material selection scheme.
Technical solution:
The Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel of the present invention, comprising:
Low-alloy steel sample is placed in corrosive liquid and is handled, processing terminate, and being mingled with for sample is observed in microscope
Object point loses the quantity in source, with the corrosion resisting property of how much judgement polar ocean environment low-alloy steel of field trash spot corrosion source quantity
It is strong and weak；Wherein, corrosive liquid contains CuCl, SnCl2And FeCl3。
Wherein, the corrosive liquid also contains HCl.HCl is the concentrated hydrochloric acid that mass fraction is 37%.
The corrosive liquid is 40~60% ethanol waters as solvent using volume fraction, in every liter of solvent, containing 45~
55mL concentrated hydrochloric acid, 0.8~1.5g CuCl, 0.3~0.8g SnCl2, 26.0~34.0g FeCl3。
In above-mentioned corrosive liquid, dehydrated alcohol is conducive to CuCl, SnCl as solvent2And FeCl3Dissolution, dehydrated alcohol
Content will affect the rate of spot corrosion generation, also need to fix its content, further preferred quality point as a kind of evaluation method
Number is 50%.
The addition of hydrochloric acid can make mixed solution be in suitable pH value range, and provide suitable chloride ion content.
CuCl、SnCl2And FeCl3Cu is provided after hydrolysis+、Sn+And Fe+, polar region seawater component is simulated, promotion activity folder is provided
The environment of sundries corrosion.
The low-alloy steel sample polishes after successively polishing on 180#, 400#, 600#, 800#, 1200# sand paper, then
The burnishing surface of sample is placed in corrosive liquid to be handled.
Time and temperature have larger impact to field trash corrosion rate, and 15~30 DEG C are room temperature environment, are convenient for short form test
Environmental device, the time, too short part field trash did not started to corrode, overlong time, and field trash extent of corrosion is deepened, and was unfavorable for micro-
Visual field observation.Preferably, when the processing, corrosive liquid temperature is 15~30 DEG C, and the processing time is 5~10 seconds, is dried up rapidly.
When the judgement, metallography microscope is placed under the microscope to sample, amplifies 100 times, counts the number in field trash spot corrosion source
Amount, using the visual field in most field trash spot corrosion source as most severe visual field, if field trash spot corrosion source≤3 in most severe visual field/
mm2, then the low-alloy steel has the ability for preferably resisting the resistance to spot corrosion of polar ocean environment.
The present invention also provides a kind of corrosion proof corrosive liquids for evaluating polar ocean environment low-alloy steel, contain
CuCl、SnCl2And FeCl3。
The corrosive liquid is 40~60% ethanol waters as solvent using volume fraction, in every liter of solvent, containing 45~
55mL concentrated hydrochloric acid, 0.8~1.5g CuCl, 0.3~0.8g SnCl2, 26.0~34.0g FeCl3。
The present invention also provides the preparations of the corrosion proof corrosive liquid of the evaluation polar ocean environment low-alloy steel
Method, comprising: the deionized water and dehydrated alcohol for taking formula ratio are sufficiently mixed, and mixing is added in the concentrated hydrochloric acid for measuring 45~55mL
In liquid, 0.8~1.5g CuCl, 0.3~0.8g SnCl are sequentially added2, 26.0~34.0g FeCl3, stirring, to whole dissolutions
After obtain corrosive liquid.
The present invention also provides the corrosive liquid answering in the corrosion resistance of evaluation polar ocean environment low-alloy steel
With.
The utility model has the advantages that
In evaluation method of the present invention, the allotment of corrosive liquid both considers the corrosion function of chloride ion, it is contemplated that in seawater
Cationic Cu+、Sn+And Fe+Influence to field trash.Inclusion analysis means compared to existing technology use the corrosive liquid, energy
Corrosion susceptibility of different types of field trash in briny environment is enough distinguished, field trash is divided into active inclusions and nonactive
Field trash is more advantageous to control metallurgical technology and forms specific corrosion resistant low alloy steel.And suitable concentration is used, it can achieve more
Good effect and time control.
In the method for the present invention, used experiment equipment type is few, cheap, and experimentation is simple, experiment week
Phase is short.
Detailed description of the invention
Fig. 1 is field trash spot corrosion source shape appearance figure after common ship steel AH36 test；
Fig. 2 is field trash spot corrosion source pattern after the steel grade 1 of special smelting mode is tested；
Fig. 3 is field trash spot corrosion source shape appearance figure after the steel grade 2 of special smelting mode is tested.
Specific embodiment
Combined with specific embodiments below, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate the present invention
Rather than limit the scope of the invention, after the present invention has been read, those skilled in the art are to various equivalences of the invention
The modification of form falls within the application range as defined in the appended claims.
Embodiment 1
Common ship steel AH36 is sampled along rolling direction, metallographic specimen is processed into, exists using in crossing method
It polishes on 180#, 400#, 600#, 800#, 1200# sand paper, and is polished on polished machine.Measure 500mL deionized water and 500mL
Dehydrated alcohol is sufficiently mixed, and measures the hydrochloric acid (mass fraction 37%) that 45~55mL density is 1.19g/ml and mixed liquor is added
In, sequentially add the SnCl of CuCl, 0.4g of 0.8g2, 28g FeCl3, stir, obtain corrosive liquid after all dissolutions.It will examination
The burnishing surface of sample immerses in prepared corrosive liquid, and 25 DEG C of corrosive liquid temperature, the processing time is 8 seconds, take out sample spend from
Sub- water rinses, and is dried up sample rapidly with hair dryer.Metallography microscope is placed under the microscope to sample, amplifies 100 times, statistics folder
The quantity in sundries spot corrosion source.Using the visual field in most field trash spot corrosion source as most severe visual field, if field trash in most severe visual field
Spot corrosion source is 25/mm2, it is much larger than 3/mm2, as shown in Fig. 1, then the common ship steel AH36 resists polar ocean environment
The ability of resistance to spot corrosion is poor, and the material is not recommended to use in polar ocean environment.
Embodiment 2
The steel grade 1 (AH36) of special smelting mode is sampled along rolling direction, metallographic specimen is processed into, using in cross
Interior extrapolation method is polished on 180#, 400#, 600#, 800#, 1200# sand paper, and is polished on polished machine.Measure 500mL deionization
Water and 500mL dehydrated alcohol, are sufficiently mixed, and measure the hydrochloric acid (mass fraction 37%) that 45~55mL density is 1.19g/ml and add
Enter in mixed liquor, sequentially adds the SnCl of CuCl, 0.4g of 0.8g2, 28g FeCl3, stir, corroded after all dissolutions
Liquid.The burnishing surface of sample is immersed in prepared corrosive liquid, 25 DEG C of corrosive liquid temperature, the time is 8 seconds, takes out sample and spends
Ionized water rinses, and is dried up sample rapidly with hair dryer.Metallography microscope is placed under the microscope to sample, amplifies 100 times, statistics
The quantity in field trash spot corrosion source.With the visual field in most field trash spot corrosion source visual field the most severe, if being mingled in most severe visual field
It is 1/mm that object point, which loses source,2, less than 3/mm2, as shown in Fig. 2, then the steel grade 1 of the special smelting mode resists polar ocean
The ability of the resistance to spot corrosion of environment is good, and the material can be recommended to use in polar ocean environment.
Embodiment 3
The steel grade 2 (AH36) of special smelting mode is sampled along rolling direction, metallographic specimen is processed into, using in cross
Interior extrapolation method is polished on 180#, 400#, 600#, 800#, 1200# sand paper, and is polished on polished machine.Measure 500mL deionization
Water and 500mL dehydrated alcohol, are sufficiently mixed, and measure the hydrochloric acid (mass fraction 37%) that 45~55mL density is 1.19g/ml and add
Enter in mixed liquor, sequentially adds the SnCl of CuCl, 0.4g of 0.8g2, 28g FeCl3, stir, corroded after all dissolutions
Liquid.The burnishing surface of sample is immersed in prepared corrosive liquid, 25 DEG C of corrosive liquid temperature, the time is 8 seconds, takes out sample and spends
Ionized water rinses, and is dried up sample rapidly with hair dryer.Metallography microscope is placed under the microscope to sample, amplifies 100 times, statistics
The quantity in field trash spot corrosion source.With the visual field in most field trash spot corrosion source visual field the most severe, if being mingled in most severe visual field
It is 0/mm that object point, which loses source,2, less than 3/mm2, as shown in Fig. 3, then the steel grade 1 of the special smelting mode resists polar ocean
The ability of the resistance to spot corrosion of environment is good, and the material can be recommended to use in polar ocean environment.
Low-alloy steel sample is taken from the hull for having run 10~20 years in polar ocean, is examined with the method, is sent out
Existing field trash spot corrosion source quantity is directly related with the corrosion resistance of hull, and field trash spot corrosion source quantity is more, and corrosion resistance is poorer,
When field trash spot corrosion source quantity≤3, the corrosion resistance of fibre reinforced plastic hull is preferable under practical Service Environment, and hull maintenance cycle is longer,
When field trash spot corrosion source quantity is greater than 3, hull maintenance cycle is obviously shortened one times or more.
Claims (10)
1. a kind of Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel characterized by comprising
Low-alloy steel sample is placed in corrosive liquid and is handled, processing terminate, and that observes sample in microscope is mingled with object point
The quantity in erosion source, with the strong of the corrosion resisting property of how much judgement polar ocean environment low-alloy steel of field trash spot corrosion source quantity
It is weak；Wherein, corrosive liquid contains CuCl, SnCl2And FeCl3。
2. the Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel according to claim 1, which is characterized in that institute
It states corrosive liquid and also contains HCl.
3. the Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel according to claim 2, which is characterized in that institute
It is 40~60% ethanol waters as solvent that corrosive liquid, which is stated, using volume fraction, in every liter of solvent, contains 45~55mL concentrated hydrochloric acid,
0.8~1.5g CuCl, 0.3~0.8g SnCl2, 26.0~34.0g FeCl3。
4. the Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel according to claim 1, which is characterized in that low
Alloy steel curved beam polishes after successively polishing on 180#, 400#, 600#, 800#, 1200# sand paper, then makes the burnishing surface of sample
It is placed in corrosive liquid and is handled.
5. the Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel according to claim 1, which is characterized in that place
When reason, corrosive liquid temperature is 15~30 DEG C, and the processing time is 5~10 seconds, is dried up rapidly.
6. the Evaluation of Corrosion Resistance method of polar ocean environment low-alloy steel according to claim 3, which is characterized in that sentence
Periodically, metallography microscope is placed under the microscope to sample, amplifies 100 times, the quantity in field trash spot corrosion source is counted, with most field trashes
The visual field in spot corrosion source is used as most severe visual field, if field trash spot corrosion source≤3/mm in most severe visual field2, then the low-alloy
Steel has the ability for preferably resisting the resistance to spot corrosion of polar ocean environment.
7. a kind of corrosion proof corrosive liquid for evaluating polar ocean environment low-alloy steel, which is characterized in that contain CuCl, SnCl2
And FeCl3。
8. the corrosion proof corrosive liquid of evaluation polar ocean environment low-alloy steel according to claim 7, feature exist
In the corrosive liquid is 40~60% ethanol waters as solvent using volume fraction, in every liter of solvent, contains the dense salt of 45~55mL
Acid, 0.8~1.5g CuCl, 0.3~0.8g SnCl2, 26.0~34.0g FeCl3。
9. the preparation side of the corrosion proof corrosive liquid of evaluation polar ocean environment low-alloy steel according to claim 8
Method characterized by comprising the deionized water and dehydrated alcohol for taking formula ratio are sufficiently mixed, and measure the concentrated hydrochloric acid of 45~55mL
It is added in mixed liquor, sequentially adds 0.8~1.5g CuCl, 0.3~0.8g SnCl2, 26.0~34.0g FeCl3, stirring, to
All corrosive liquid is obtained after dissolution.
10. corrosive liquid according to claim 7 or 8 answering in the corrosion resistance of evaluation polar ocean environment low-alloy steel
With.
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| CN111089831A (en) * | 2020-01-03 | 2020-05-01 | 北京科技大学 | Corrosion resistance evaluation method of low-alloy structural steel |
| CN113252543A (en) * | 2021-05-13 | 2021-08-13 | 中国海洋石油集团有限公司 | Rapid screening and evaluation method for corrosion resistance of stainless steel material |
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| CN111089831B (en) * | 2020-01-03 | 2021-03-23 | 北京科技大学 | Corrosion resistance evaluation method of low-alloy structural steel |
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